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Author Subject: one for the wiring gurus......
BlackSix

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Registered: 30 Jul 2012

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Post #1
ok, so i kinda reached my final straw with this car and left it with a local garage.

they plugged it in and found all sensors to be reporting as they should be, even though the whole car was shaking and trying to die.

he repaired a couple of wires and cleaned out the connections for all sensors around the throttle body and it was PERFECT.....for all of about 5 hours..then it started again.

ive checked the repairs and they look to be good quality.

im going back there tomorrow at some point because the fault is back. im just trying to find out more info that would help find the problem thats all.

are there any "common" failure points for the engine bay wiring loom? im thinking im going to end up having to replace the lot to eliminate the fault, but id rather not have to as it could be expensive/make me burn the car with frustration.



Posted 12th Aug 2012 at 14:58
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fatlapit

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Post #2
Earths are s**t

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Posted 12th Aug 2012 at 15:05
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dangti6

aka JKshooter

Location: Taunton, Somerset

Registered: 15 Jun 2006

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Post #3
At around £25 for a loom, I'd be replacing the whole thing for piece of mind.

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    • Posted 12th Aug 2012 at 15:15
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    BlackSix

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    Post #4
    how bad of a job is it?
    Posted 12th Aug 2012 at 15:19
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    dangti6

    aka JKshooter

    Location: Taunton, Somerset

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    Post #5
    Unplug, plug.

    It's colour coded and the plugs only go on the correct sensors as there are locator tabs which mean you can't plug the wrong ones on.

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    • Posted 12th Aug 2012 at 15:22
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    BlackSix

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    Post #6
    sooo does anything need to come out to do it besides the old wiring loom? and how long would it take someone whos never done it before but isnt a total noob? lol
    Posted 12th Aug 2012 at 15:23
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    bigbadbowen

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    Post #7
    Inlet manifold off to change whole engine loom ?

    I'd be checking the earthing points first though Thumbs up

    Posted 12th Aug 2012 at 15:27
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    BlackSix

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    Post #8
    i have done bud, checked and replaced a coulpe as well as wire brushing the connections
    Posted 12th Aug 2012 at 15:31
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    dangti6

    aka JKshooter

    Location: Taunton, Somerset

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    Post #9
    There's not a great deal of loom really. You can leave the positive wiring to the starter and alternator as that can stay. Get your head under your bonnet and have a quick look. Once you pop the 4 plugs off the coil packs, 4 injectors and the throttle body/inlet ones you only have half a dozen or so at the front of the engine to unplug like the oil temp to the sump and the air con one down there. There's nothing hidden as such. Plenty of room to get your hands in and around. Then when you have it all free you can get the ECU and fuel pump relay unplugged and tackle where the loom joins the bottom corner by the rad.

    Defo a 1 spanner job for a noob. A tip for if you have trouble getting your finger in to push the clip on top of any plugs, get a screwdriver and flip the clip fully off and then the plug will practically fall off. The you can just push the clip back on to the plug. Makes it quicker when you only have one hand in trying to press and pull at the same time.

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    • Posted 12th Aug 2012 at 15:32
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    bigbadbowen

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    Post #10
    Have you changed the idle control valve ?

    Have you tried the power steering sensor ? Funny as it sounds it will cause all sorts of problems ?
    Posted 12th Aug 2012 at 15:34
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    dangti6

    aka JKshooter

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    Post #11
    This is all there is to it:



    There's an earth on it to the gearbox. The speedo sensor plug is down the back under a silver sleeve and the lambda sensor plug slides out the same as the fuel pump relay.

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    • Posted 12th Aug 2012 at 15:36
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    BlackSix

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    Post #12
    tried all of that mate, see thread in engines section for the full list of what ive already done/had done. wiring is probably the only thing it can be now.

    so at plodding along pace, bout 30 mins to an hour job done? then a few cable ties to secure it?
    Posted 12th Aug 2012 at 15:38
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    dangti6

    aka JKshooter

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    Post #13
    Won't take you long at all. There are clips already there. Under the inlet there are 2 that open up and hold the loom there. You'll wonder what all the fuss was about after.

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    • Posted 12th Aug 2012 at 15:46
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    stan_306gti6 Forum Admin

    Location: Kent

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    Post #14
    Just as a heads up...

    One common place with the loom which *is* known to causes issues are the two main plugs which connect to the inner wing down by the bottom of the rad. Yes
    These can get badly corroded due to their location. I would suggest disconnecting these two main plugs and cleaning all the spade connections inside them. If this doesn't cure it, then I would say new loom time. Yes

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    Posted 12th Aug 2012 at 19:03
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    BlackSix

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    Post #15
    cheers Smile il give it a go tomorrow
    Posted 12th Aug 2012 at 20:55
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    miles

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    Post #16
    You can use a Data logger depending on the age of the car on the ODB port, this log's faults like this that are intermittent
    Finding a Garage with one thou is another matter

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    Posted 12th Aug 2012 at 23:28
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    eliotrw

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    Post #17
    Do some 6's have ODB? i didnt know that?
    Does this mean we can connect thouse fancy apps on phones to them to get 0-60 and digi speedos etc?

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    Posted 13th Aug 2012 at 15:21
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    eliotrw

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    Post #18
    Just realised Im thinking of OBD-II Doh

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    Posted 13th Aug 2012 at 15:27
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    BlackSix

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    Post #19
    had it back up the garage because they got it running good on friday..albeit breifly...heres what they had to say....

    numerous bodges/repairs/exposed wires, at one point one of the injectors had been cut off, the map sensor wiring has been chopped/probed, crank sensor wiring is just about fecked, good news is that the connections near the rad are in good condition.

    in the mechanics words, its a total frankenbodge loom, he said hes surprised it even runs
    Posted 13th Aug 2012 at 17:50
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    dangti6

    aka JKshooter

    Location: Taunton, Somerset

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    Post #20
    Think of all those spares you have LOL

    I'd pop your originally replaced items back on one by one once you have it running well with a new loom so you can see if any of your replacements are actually necessary. If not, sell the replacements you bought and recoup some of your expenditure back.

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    • Posted 13th Aug 2012 at 18:00
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    eliotrw

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    Post #21
    Lmao bit of a bodge job loom then. Slowly you start to hate previous owners of your car. The guy that had mind seems like a bit of a Kent tbh. If you look back there's an old I spy post where he nearly cut up allescar
    My previous owners skills include covering bare metal up with the gutterstripes and just using sealant on top.
    Wiring up a sub (badly)
    Breaking the rear bench mounting
    Using the totally wrong nut on the heatshield so it snapped it leaving me to wonder what the weird busting noise was.
    Also fudging the locks and being a cheap Kent and not getting radio ones
    Then taking it to a garage that clipped them in the wrong way round so I had to strip the door to get at them

    Also he left a durex, Sealed thankfully , in the back seat... PIMP.

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    Posted 13th Aug 2012 at 18:16
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    BlackSix

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    Post #22
    the guy i got mine off is on this forum and tried to sell me parts to put it right after he lied through his arse about what was causing the problem in the first place. theres no doubt he knew what he was doing too, hes broken enough of them to know it wasnt right.

    and sounds like the previous owner of yours hung around with some right classy women/men/combo of the 2

    edit: it looks like most of the bits ive changed are fairly common failure points so may as well hang onto the bits for now at least
    Posted 13th Aug 2012 at 18:35
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    buzzbrightyear

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    Post #23
    I think I was lucky, I can't rember finding any bodge Jobs On mine at all and it's just about all been stripped at least once, infact I think he must of really loved and Cherished it. it had a psoc club membership thing in the glove box.

    When I bought the mondeo you should of seen the bodge job of the rear tv's wiring, they had taken the
    Live from the courtesy lights and when you indicated the interior lights came on LOL

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    andrew315rawson@live.co.uk
    Moonstone phase 7 gti6
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    Posted 14th Aug 2012 at 00:07
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    buzzbrightyear

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    Post #24
    BlackSix wrote:
    the guy i got mine off is on this forum and tried to sell me parts to put it right after he lied through his arse about what was causing the problem in the first place. theres no doubt he knew what he was doing too, hes broken enough of them to know it wasnt right.

    and sounds like the previous owner of yours hung around with some right classy women/men/combo of the 2

    edit: it looks like most of the bits ive changed are fairly common failure points so may as well hang onto the bits for now at least

    Name and shame dude name and shame.

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    andrew315rawson@live.co.uk
    Moonstone phase 7 gti6
    My Project thread: http://www.306gti6.com/forum/showthread.php?id=119992&page=1
    Posted 14th Aug 2012 at 00:07
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    BlackSix

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    Post #25
    so ive got my wiring loom, just going to get a manifold gasket before i start.

    has anyone got any last minute advice? i know there are a fair few plugs that arent used so it could get confusing. what i was going to do is label the old loom before i take it off then put it next to the new loom and transfer the labels over.

    il take pictures as i do it and do my best to do a detailed write up at then end when its running again Smile
    Posted 14th Aug 2012 at 13:18
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